Pentair Minimax Nt heater wont turn on and heat, "err" message

I have a Pentair Minimax NT heater and everytime I try to turn it on, it will read "err" and the service light will turn on. I have powered off the unit and turned it back on and that fixed the problem once and it was fine for about a week but that quick fix is not working anymore. why is it not kicking out heat and reading "err"

I have a Pentair Minimax NT heater and everytime I try to turn it on, it will read "err" and the service light will turn on. I have powered off the unit and turned it back on and that fixed the problem once and it was fine for about a week but that quick fix is not working anymore. why is it not kicking out heat and reading "err". I have the same problem. Can someone post a solution please? Thanks,

Mie

I have a Pentair Minimax NT heater and everytime I try to turn it on, it will read "err" and the service light will turn on. I have powered off the unit and turned it back on and that fixed the problem once and it was fine for about a week but that quick fix is not working anymore. why is it not kicking out heat and reading "err".

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Sounds like the controller is the problem. This is the circuit board that has the display and controls on it. You can swing that panel open and try tapping on the white plastic cover the controller is under that. This might get the fan relay to release but you will have to replace the controller it will stick again